High Frequency Postgraduate Student Colloquium, 2005

5-6 Sept. 2005

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  • The Tenth High Frequency Postgraduate Student Colloquium (IEEE Cat. No. 05TH8848)

    Publication Year: 2005
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  • The Tenth High Frequency Postygraduate Student Colloquim

    Publication Year: 2005, Page(s): i
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  • Copyright page

    Publication Year: 2005, Page(s): ii
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  • Introduction

    Publication Year: 2005, Page(s): iii
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  • Schedule

    Publication Year: 2005, Page(s):iv - vii
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  • [Breaker page]

    Publication Year: 2005, Page(s): 1
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  • Micromachined screen printing (MaSPrint) technology for RF MEMS applications

    Publication Year: 2005, Page(s):3 - 6
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (3414 KB) | HTML iconHTML

    Traditional screen-printing technologies have long been used for manufacturing large volume RF circuits. While being an extremely low cost manufacturing solution, there have been relatively few major advancements. For this reason, the resulting thick-film components are generally restricted to microwave frequencies of operation, due to limitations in manufacturing tolerances. At the same time, sur... View full abstract»

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  • Studies on passive intermodulation phenomena in printed and layered transmission lines

    Publication Year: 2005, Page(s):7 - 10
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1378 KB) | HTML iconHTML

    This paper reports on the recent developments into the investigation of passive intermodulation products (PIMs) in PCB based printed and layered transmission lines. Based on the results of earlier experiments, potential sources of PIM generation are examined, and a new semi-phenomenological model of PIM production mechanisms is discussed. The proposed model assumes non-local nature of PIM sources ... View full abstract»

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  • Advanced multilayer thick-film technology for cost-effective millimetre-wave multi-chip modules

    Publication Year: 2005, Page(s):11 - 14
    Cited by:  Papers (11)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (3428 KB) | HTML iconHTML

    This paper describes the novel application of photoimageable thick film technology for the realization of multilayer millimeter-wave multi-chip modules at a low cost. The dielectric material has been characterized first time up to 110 GHz with a novel technique. TFMS and CPW transmission lines have been characterized with a loss of 0.2 dB/mm and 0.3 dB/mm respectively at 80 GHz. High Q multilayer ... View full abstract»

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  • Novel cost-efficient packaging technology for high-power LDMOS devices

    Publication Year: 2005, Page(s):15 - 18
    Cited by:  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (2064 KB) | HTML iconHTML

    Packaging is crucial factor in maximizing the RF power transistors performance. Since the RF power device is the most expensive component within a high-power amplifier, there is a substantial market pressure to reduce the cost of the transistor and its packaging. This paper presents a novel packaging technology which uses the high-frequency laminates as a base material replacing the currently domi... View full abstract»

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  • [Breaker page]

    Publication Year: 2005, Page(s): 19
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  • A broadband envelope load pull system

    Publication Year: 2005, Page(s):21 - 24
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1139 KB) | HTML iconHTML

    The paper presents an active envelope load-pull system for the active control of load impedance over a bandwidth of approximately 100 MHz, hence extending the employment of active load pull systems to modulated signals. As a result, the load-pull system can be also employed for linearity investigations of non-linear devices, which is crucial for telecommunication systems. Moreover, the presented l... View full abstract»

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  • Direct extraction of large-signal table-based behavioural models from time-domain voltage and current waveforms

    Publication Year: 2005, Page(s):25 - 28
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1471 KB) | HTML iconHTML

    This paper presents a novel table-based nonlinear behavioural model extracted directly from large-signal time-domain measurements. The model has been verified on several types of power devices and can accurately predict the behaviours of devices under large-signal CW excitations-the model is implemented in Agilent ADS. View full abstract»

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  • A measurement test-set for characterisation of high power LDMOS transistors including memory effects

    Publication Year: 2005, Page(s):29 - 32
    Cited by:  Papers (9)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1117 KB) | HTML iconHTML

    The paper presents a test-set enabling precise measurement of all signal components generated by a modulated stimulus, hence allowing for device characterisations relevant for communication systems. The presented test-set utilises two different types of coupler networks to detect the fundamental and harmonic signal components, and the IF signal components, respectively. Furthermore, the test-set i... View full abstract»

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  • [Breaker page]

    Publication Year: 2005, Page(s): 33
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  • Surface plasmons in layered semiconductor-dielectric structures

    Publication Year: 2005, Page(s):35 - 38
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1289 KB) | HTML iconHTML

    Eigenwaves in a parallel plate waveguide loaded with a tangentially magnetised semiconductor layer sandwiched between two dissimilar dielectric layers are analysed. The dispersion equation (DE) is factorised in order to separate dynamic and plasmonic type waves. Then asymptotic solutions of the factorised DE are obtained in closed form for the plasmonic type eigenwaves and used as initial approxim... View full abstract»

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  • Switching characteristics analysis of GaAs HBTs using eye diagram

    Publication Year: 2005, Page(s):39 - 42
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1368 KB) | HTML iconHTML

    This paper presents the use of eye diagram as a functional tool to study the response of InGaP/GaAs double heterojunction bipolar transistor (DHBT) in digital environment. In this work, sensitivity analysis carried out to study the switching characteristics and to quantify the performance of the devices through the eye diagrams has been presented for the first time. The discussion includes the res... View full abstract»

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  • Thermally self-consistent Monte Carlo simulation of InGaAs/AlGaAs HEMTs

    Publication Year: 2005, Page(s):43 - 46
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    This paper presents results from the application of a thermally self-consistent Monte Carlo (MC) simulator to In/sub 0.15/Ga/sub 0.85/As/Al/sub 0.28/Ga/sub 0.72/As HEMTs. The simulator employs an iterative procedure which couples a MC electronic trajectory simulation with a fast Fourier series solution of the heat diffusion equation (HDE). Monte Carlo is one of the most accurate methods for simula... View full abstract»

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  • InP HBT technology for high frequency applications

    Publication Year: 2005, Page(s):47 - 49
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1771 KB) | HTML iconHTML

    The development of a new process for fabricating transferred substrate heterojunction bipolar transistors is discussed, in which the emitter contact resistance is kept low in spite of submicron dimensions, thus achieving a device free from scaling limits. View full abstract»

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  • [Breaker page]

    Publication Year: 2005, Page(s): 51
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  • Antenna effects in impulse radio communication systems

    Publication Year: 2005, Page(s):53 - 56
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (710 KB) | HTML iconHTML

    A complete simulation of an ultra-wide band communication system in an indoor environment has been undertaken in the time domain. This utilizes time domain 3-D ray tracing coupled with antenna modeling to provide an overall channel simulation. The time-domain radiating characteristics of different linear antennas in transmission and reception in a typical indoor environment are used as representat... View full abstract»

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  • Towards a microstrip antenna on synthetic high-dielectric constant substrates

    Publication Year: 2005, Page(s):57 - 61
    Cited by:  Papers (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (2482 KB) | HTML iconHTML

    This work is an investigation into the dielectric properties of multilayered substrates. We focus on slow-wave polarization modes, known to occur in some layered substrates. We envisage exploiting the high resonant dielectric constant to obtain increased directivity of patch antennas. Issues such as reduced electrical efficiency due to a greater number of back-lobes, directed into the substrate, a... View full abstract»

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  • Beam steering reflectarrays using liquid crystal substrate

    Publication Year: 2005, Page(s):62 - 65
    Cited by:  Papers (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1142 KB) | HTML iconHTML

    Radar acquisition and tracking systems often require the generation of single or multiple dynamically reconfigurable beams, which must be steered rapidly within the scan volume. Microstrip phased arrays are often used for these applications because this type of antenna can normally be designed to satisfy the pattern shape and coverage requirements and the beam can be scanned simply by varying the ... View full abstract»

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  • Mutual impedance between bifilars of a quadrifilar helix antenna

    Publication Year: 2005, Page(s):66 - 69
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (529 KB) | HTML iconHTML

    In this paper we present the results of a study to quantify the mutual coupling between the two bifilars of a 1/2 turn 1/2 wavelength quadrifilar helix antenna (QHA). A new circuit model approach is used which is suitable for computing the impedance when the structure is fed by a single voltage source as in the case of a self phasing QHA. The validity of the circuit model is first confirmed by com... View full abstract»

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  • [Breaker page]

    Publication Year: 2005, Page(s): 71
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